The European Space Agency (ESA) launched a telescope Wednesday morning that will orbit the Earth for the next 3.5 years, looking for signs of life on faraway planets.

Cheops — the telescope’s name which stands for CHaracterising ExOPlanet Satellite — was launched at 3:54 a.m. ET Wednesday from the European spaceport in Kourou, French Guiana, The BBC reported.

The mission of Cheops is a bit different than existing telescopes attempting to find other planets. Instead of hunting down new places in the universe, Cheops will study planets we already know exist (there are 400-500 on its list) and hopefully learn a bit about their density, atmosphere and evolution. Scientists hope to discover whether or not any of these planets are habitable.